Synthesis, structural isomerism, and magnetism of extended framework compounds of type [Cu(dca)2(pyz)]n, where dca = dicyanamide (N(CN)2-) and pyz = pyrazine

被引:0
|
作者
Jensen, P
Batten, SR
Fallon, GD
Hockless, DCR
Moubaraki, B
Murray, KS [1 ]
Robson, R
机构
[1] Monash Univ, Dept Chem, Clayton, Vic 3168, Australia
[2] Australian Natl Univ, Res Sch Chem, Canberra, ACT 0200, Australia
[3] Univ Melbourne, Dept Chem, Parkville, Vic 3052, Australia
基金
澳大利亚研究理事会;
关键词
structure; magnetism; extended framework; copper (II); dicyanamide; pyrazine;
D O I
10.1006/jssc.1998.8082
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Two structural isomers of the dicyanamide (dca, N(CN)(2)(-)) complex [Cu(dca)(2)(pyz)](n) (pyz = pyrazine) were prepared from aqueous solution and crystals were grown by slow diffusion and gel techniques. Crystal data: alpha-[Cu(dca)(2)(pyz)](n), CuC8H4N8, monoclinic, Pn, Z = 16, a = 24.2549(7) Angstrom, b = 6.8571(2) Angstrom, c = 24.6445(7) Angstrom, beta = 91.023(2)degrees, V = 4098.2(2) Angstrom(3), R(F)= 0.0466 (F > 4 sigma(F)), R-w(F-2)= 0.0939 (all data); beta-[Cu(dca)(2)(pyz)](n), CuC8H4N8, monoclinic, C2/m, Z = 2, a = 9,7659(8) Angstrom, b = 6.8787(7) Angstrom, c = 7.3870(5) Angstrom, beta = 95.254(7)degrees, V = 494.15(6) Angstrom(3), R(F)= 0.038, R-w(F)= 0.074 (I > 3 sigma(I)). The alpha-isomer consists of two interpenetrating alpha-Po related networks, while the beta-isomer contains sheets composed of Cu(dca), chains linked by bridging pyz ligands. Despite the differences in their network structures, the magnetic properties of these structural isomers are essentially the same. Weak antiferromagnetic coupling of the S = 1/2 centers leads to a maximum in susceptibility at 3.5 K, One of the aims of this work is to prepare long-range ordered materials but no magnetic order is observed in the present compounds. The antiferromagnetic coupling is a little stronger than that in the parent Cu(dca), but of similar strength to that in chain compounds of type [Cu(dca)(2) (imidazole)(2)](n). Thus, the pyz linkers enhance the coupling to only a small degree. The networks in the a-isomer behave independently and identically from the magnetic point of view. (C) 1999 Academic Press.
引用
收藏
页码:387 / 393
页数:7
相关论文
共 50 条
  • [1] Synthesis, structural isomerism, and magnetism of extended framework compounds of type [Cu(dca)2(pyz)]n, where dca = dicyanamide (N(CN)-2) and pyz = pyrazine
    Chemistry Department, Monash University, Clayton, Vic. 3168, Australia
    不详
    不详
    J. Solid State Chem., 2 (387-393):
  • [2] Synthesis, structural isomerism, and magnetism of the coordination polymers [M(dca)2pyz], M = Mn, Fe, Co, Ni and Zn, dca = dicyanamide (N(CN)2-), and pyz = pyrazine
    Jensen, P
    Batten, SR
    Moubaraki, B
    Murray, KS
    JOURNAL OF SOLID STATE CHEMISTRY, 2001, 159 (02) : 352 - 361
  • [3] Magnetic ordering and spin excitations in Mn(dca)2(pyz) [dca = N(CN)2-, pyz = pyrazine]
    J.L. Manson
    H.N. Bordallo
    J.W. Lynn
    Q. Huang
    R. Feyerherm
    A. Loose
    L. Chapon
    D.N. Argyriou
    Applied Physics A, 2002, 74 : s722 - s724
  • [4] Magnetic ordering and spin excitations in Mn(dca)2(pyz) [dca = N(CN)2-, pyz = pyrazine]
    Manson, JL
    Bordallo, HN
    Lynn, JW
    Huang, Q
    Feyerherm, R
    Loose, A
    Chapon, L
    Argyriou, DN
    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 2002, 74 (Suppl 1): : S722 - S724
  • [5] Spin fluctuations and orbital ordering in quasi-one-dimensional α-Cu(dca)2(pyz) {dca = dicyanamide = N(CN)2-; pyz = pyrazine}, a molecular analogue of KCuF3
    Manson, Jamie L.
    Lancaster, Tom
    Blundell, Stephen J.
    Qiu, Yiming
    Singleton, John
    Sengupta, Pinaki
    Pratt, Francis L.
    Kang, Jinhee
    Lee, Changhoon
    Whangbo, Myung-Hwan
    POLYHEDRON, 2010, 29 (01) : 514 - 520
  • [6] Structural and magnetic properties of the coordination polymer Mn(dca)2(H2O)2•2Me4pyz, dca = dicyanamide (N(CN)2-), Me4pyz = tetramethylpyrazine
    Kutasi, AM
    Batten, SR
    Harris, AR
    Moubaraki, B
    Murray, KS
    AUSTRALIAN JOURNAL OF CHEMISTRY, 2002, 55 (05) : 311 - 313
  • [7] Structure and molecular magnetism of the rutile-related compounds M(dca)2, M = CoII, NiII, CuII, dca = dicyanamide, N(CN)2-
    Batten, SR
    Jensen, P
    Moubaraki, B
    Murray, KS
    Robson, R
    CHEMICAL COMMUNICATIONS, 1998, (03) : 439 - 440
  • [8] Syntheses, structures and magnetic properties of [MII(dca)2(CH3OH)2]n, where M = Co or Cu and dca- = dicyanamide, N(CN)2-
    Biswas, Moumita
    Rosair, G. M.
    Pilet, Guillaume
    Mitra, Samiran
    INORGANICA CHIMICA ACTA, 2007, 360 (02) : 695 - 699
  • [9] The structural characterization of the novel ribbon sheet, [Cu2Cl2(pyz)](n) (pyz=pyrazine)
    Kawata, S
    Kitagawa, S
    Kumagai, H
    Iwabuchi, S
    Katada, M
    INORGANICA CHIMICA ACTA, 1998, 267 (01) : 143 - 145
  • [10] Hydrothermal Synthesis and Structure of [(PbCl2)(μ-Pyz)1/2]n (Pyz = Pyrazine)
    LIAO Qiu-Xia ZHANG Jian QIN Ye-Yan YAO Yuan-Gen (State Key Laboratory of Structural Chemistry
    Chinese Journal of Structural Chemistry, 2006, (07) : 789 - 792